999975440 has 40 divisors (see below), whose sum is σ = 2363068248. Its totient is φ = 393431040.

The previous prime is 999975437. The next prime is 999975461. The reversal of 999975440 is 44579999.

It can be written as a sum of positive squares in 4 ways, for example, as 13512976 + 986462464 = 3676^2 + 31408^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97577 + ... + 107336.

Almost surely, 2^999975440 is an apocalyptic number.

It is an amenable number.

999975440 is an abundant number, since it is smaller than the sum of its proper divisors (1363092808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999975440 is a wasteful number, since it uses less digits than its factorization.

999975440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204987 (or 204981 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 56.

The square root of 999975440 is about 31622.3882716028. The cubic root of 999975440 is about 999.9918132663.

The spelling of 999975440 in words is "nine hundred ninety-nine million, nine hundred seventy-five thousand, four hundred forty".